karellen / karellen-lsp-mcp / 23696026736

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[release] Add jdtls extendedClientCapabilities for library code support (#25)

## Summary

- Enable `classFileContentsSupport` in jdtls init options so it can
return `jdt://` URIs for class files in JARs, expanding search scope to
include application and system libraries. Without this, call hierarchy
items, references, definitions, and implementations pointing into
library code are silently dropped due to null locations.
- Enable `shouldLanguageServerExitOnShutdown` as a safety net — jdtls
will self-exit 1s after shutdown if the client doesn't send `exit`,
preventing orphaned processes.

## Test plan

- [x] Unit tests pass (285/285)
- [ ] CI build passes
- [ ] Integration test with jdtls verifies outgoing call hierarchy
returns library callees

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3 of 4 new or added lines in 1 file covered. (75.0%)

2222 of 2864 relevant lines covered (77.58%)

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